文献类型：期刊文献

英文题名：Vertical circulation and heat flux of coastal ocean fronts in the northwestern South China Sea

作者：Tan, Keyi[1];Xie, Lingling[1,2,3];Li, Junyi[1,2,3];Li, Mingming[1,2,3];Li, Qiang[1,2,3];Zheng, Quanan[4]

机构：[1]Guangdong Ocean Univ, Coll Ocean & Meteorol, Lab Coastal Ocean Variat & Disaster Predict, Zhanjiang 524088, Peoples R China;[2]Key Lab Climate Resources & Environm Continent She, Zhanjiang 524088, Peoples R China;[3]Minist Nat Resources, Key Lab Space Ocean Remote Sensing & Applicat, Zhanjiang 524088, Peoples R China;[4]Univ Maryland, Dept Atmospher & Ocean Sci, College Pk, MD 20742 USA

年份：2025

卷号：290

外文期刊名：CONTINENTAL SHELF RESEARCH

收录：SCI-EXPANDED(收录号：WOS:001480186800001)、、Scopus(收录号：2-s2.0-105003178301)、WOS

基金：This research was funded by the National Natural Science Founda-tion of China (42276019) ; the National Science and Technology Major Project (2024YFC2817003) ; Innovation Team Plan for Universities in Guangdong Province (2019KCXTF021, 2023KCXTD015) ; Science and Technology Planning Project of Guangdong Province (2024B1212040008) .

语种：英文

外文摘要：This study investigates the 3D structure and vertical circulation of the coastal ocean fronts in the northwestern South China Sea (NWSCS) by applying the generalized Omega equation to cruise observations in late August and early September 2018. The results reveal three summer density front zones (SUF1 similar to 3) in the surface and subsurface layers. SUF1 is distributed along the coast with water depths shallower than 20 m and a density gradient larger than 0.2 x 10(-3) kg m(-4). It extends vertically from surface to bottom and is dominated by salinity gradient. In contrast, SUF2 and SUF3 are temperature-dominated frontal zones appearing in the offshore subsurface layer. SUF2 is in the cross-shelf direction between the 20-m and 40-m isobaths associated with upwelling waters originating from the south. The observed submesoscale fronts have a Rossby number of O(1). The diagnosed vertical velocities indicate that an upwelling peak of 4.2 x 10(-5) m s(-1) is located near the coast in SUF1, while, in contrast, a maximum vertical velocity of -5.1 x 10(-5) m s(-1) in the cross-shelf SUF2. Dynamic analysis results indicate that ageostrophic advection is the dominant term. The vertical heat fluxes derived from the vertical velocity and temperature anomaly are mainly positive both in SUF1 and SUF2, with a maximum value of 279.5 W m(-2) and 418.8 W m(-2), respectively, which are one order larger than the sea surface heat flux during the observation.